US1247456A - Paper-feed roll for writing-machines. - Google Patents

Description

A. A. SCHWARTZ. PAPER FEED ROLL Fon WRITING MACHINES,

APPLICATION FILED APR. 28.19II.

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ALBERT A. SCHWARTZ, OF NEW YORK, N. Y., ASSIGNOR TO ROYAL TYPEWRETEM. COMPANY, INC., OF NEW YORK, N. Y., A. CORPORATION OF NEW YORK.

PAPER-FEED ROLL FOR WRITING-MACHINES.

Specification of Letters latent.

Application led April 28, 1917. Serial No. 165,057.

To all whom t may concern Be it known that I, ALBERT A. SCHWARTZ, a citizen of the United States, and a resident of the borough of Bronx, in the city of N ew 5 York, county of Bronx, and State of New York, havel invented certain new and useful Improvements in Paper-Feed Rolls for Writing-Machines, of which the following is a specication. l The present invention relates generally to type-writing machines and has more particularly reference to a pressure roll or a system of pressure rolls cooperating with the platen to effect the proper feed of the paper and to the means for varying the tension of said4 pressure roll or pressure roll system against the platen.

ln the character of machine under consideration there is usually employed what is known as a front pressure roll and a rear pressure roll, both of which are located below Qthe axis of rotation of the platen. These pressure rolls are held in yielding engagement with the platen and suitable means are provided for effecting the release of said rolls at the will of the operator.

ln the art as heretofore practised, it has been the usual custom to employ flat springs for urging the rolls into engagement with so the platen, and such flat springs have been located at what seemed the most convenient point for creating the 'right tension upon the Apressure rolls, with the result that at times these springs have been located at points where they were not readily accessible for the purpose of replacement or adjustment, and, furthermore, where they might easily become deranged or displaced by the moving parts of the machine. Also the character of the springs used and their location both contributed to rendering it extremely dicult or inconvenient to vary the tension of the springs or the pressure with which the rolls engage the platen.

lThe main object of this invention is to so relate the springs which urge the'pressure rolls, and especially the front pressure roll, to the other parts of the machine that access for adjustment or repair may easily and to quickly be made. Another object of the 1nvention is to make the utilization possible of a spring commonly known as a coiled spring in place of flat springs. n

With these and other objects in view, one et feature of the invention consists in so arranging the spring means for the front pressure roll that its tension may be adjusted from the rear ofthe carriage. In the character of front pressure roll commonly used 1n machines of this type, there is utilized as a part of the supporting means for the front pressure roll a lever which is pivotally supp orted on the carriage. With this construction the spring means will preferably be arranged to press against said lever at a point in rear of and below its pivotal support, and the end of the spring is housed in the lower carriage rail and may be adjusted from the rear thereof.

further feature of the invention resides in rendering both the front and rear pressure roll springs accessible and adjustable from the rear of the carriage.

So far as the feature relating to the use of the coiled spring is concerned, the invention embraces a pressure roll mounted on suitable supporting means on the carriage, together with two bearings, both of which are provided with means for preventing lateral displacement of the coiled spring, while permitting its central portion to remain unguided and capable of ilexure out of its own plane. @ne of said bearings is 4adjustable to vary the tension of the opening, and, preferably, the adjustable bearing is the one which is mounted on the carriage.

fn the accompanying drawings the invention is illustrated in several preferred forms, and in these drawings: y

Figure 1 is a plan view of the lower portion of the carriage, and the elements associated therewith', the platen and the rear pressure roll and the paper pan being removed, and arts being broken away and shown in section for the sake of clearness in illustration.

Fig. 2 is a vertical sectional view on the irregular line 2-2 both through the front and rear pressure rolls, and withy the platen indicated diagrammatically.

lFig. 3 is a view similar to Fig. 2 showing a modified form of the invention.

Fig. a isadetail sectional view on the line 4.--4 of Fig. 3.

5 is the platen suitably mounted onthe carriage in any desired manner, and 6 indicates the lower carriage rail of the carriage. 7 is the support for the paper pan 8.l 9 is the front pressure roll and 10 is the rear pressure roll.

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'llhe front pressure roll is il@ mounted in the carriage by a suitable supporting means which, in this instance, takes the following form. 11 indicates a lever having a forwardl extending arm 12 and a' rearwardly extending arm 13, said lever being pivoted at its central portion on the rod '14. There will, of course, be as many of these levers as may be necessary to properly support the front pressure roll, but only one need be described since they are all constructed alike. Mounted at a point below the pivotal center 14 of the lever 11 and in the 'rear thereof, is a stem o r projection 15 which extends rearwardly and is opposite to an aperture 16 in the rear wall of the lower carriage rail. and seated within this aperture which forms a housingtherefor is a coiled spring 17. Seated in the aperture 16 and accessible from the rear of the lower carriage rail is a set screw 18. It will be observed 'that the stem 15, the aperture 16 and set sck ew 18 form bearings for the said coiled spring 17 and that the tension of this spring may be varied by adjusting the screw 18, SuitableA means are provided for releasing the pressure roll 9 in this instance taking the iorm of a releasing cam bary 19 which is suitably mounted in the lower carriage rail 6 at av point above the housing for the springs \17 and the screw 18. The said cam releasing bar 19 is provided with a suitable cam surface as 20 which engages with the. rearwardly, extending arm 13 of the lever 11 and is operated in a manner well understood in the art to eifect the release of the front res sure roll. Suitable means are provide for holding the rod 14 and cam bar 19 in' place consisting here of the retaining members 36 which overlie both of said members and which are attached lto the carriage as by means of the screws 37.

-The rear pressure'roll l0 is, mounted in the swinging lever 21 which is pivoted at 22 on the paper pan support 7 and, in the form here disclosed, the cam releasing bar 19 may be provided with another cam surface 23 which acts against the lever 21 and thus causes the rear pressure roll 10 to be moved out of ,contact with the platen. Normally, however, this rear pressure roll will be held in yieldin contact with the platen by means of the coi ed s ring 24 which is seated between the two earings 25 and 26, said bearings -being constructed to prevent lateral displacement of the spring 24, while leaving its central portion unguided.` In the presf ent form the bearing. 25 consists of an eX- tension, as shown, mounted on the paper pan support, while the bearing 26 consists of a screw adjustably mounted in the lug 27 of the lever 21 and having also a reduced portion 28 at the point where the splring 24' comes in engagement therewith. T e coiled spring 24 here surrounds the reduced por- Surrounding said stein 15 moving parts of the mechanism.

In the modification shown in Fig.y 3 the arm 12 of the front pressure roll is provided with a bearing having the stem or reduced portion 29, and the lower carriage rail is also provided with abearing having a reduced portion or extension 30. Between these two bearings there is a coiled spring 31 which is thus held securely in position by the projecting stems 29 and 30, while leaving its central portion unguided. In this instance it will be noted that the bearingsy for the s ring'are on the front of the mechanism.` his construction is not so advantageous asl where the parts are accessible from the rear ofv the lower carriage rail but it serves to illustrate another form of Vadvantageous means for utilizing a coiled spring forthe purpose of holding a pressure roll under tension against the platen. In this instance the reduced portion 30 is carried by a plate 32 havingthe oblong slot 33 and attached to the lower carriage rail by means of the set screw 34. It will be obvious that by loosening the screw 34 the plate 32 may be adjustedA up or down, as the case 'may be, to obtain the requisite tension of the spring 31, after which the set screw rwill be tightened and the parts remain-in the position to'which they have been adjusted.

ln Fig. 3 the rear pressure roll 10'is conventionally illustrated as being held in engagement with the platen -by means of the flat spring 35 engaging the lever 21.

An important feature of the means devised for utilizing the coiled sprin resides' in the fact that while the ends of t e coiled spring are securely held by reduced portions of the bearings or by suitable housing, yet the middle portion of the spring is left unguided and therefore acts as asort of iexible joint during. the pivotal movement of the lever carrylng the pressure roll.

I claim:

1. A laterally movable carriage including a low er carriage rail, a .platen and a front `pressure roll for the platen,V both mounted tension of the sp rearwardly extending arm, a coiled spring pressing against the supporting means in the rear of and below the pivotal point of the lever, said spring being housed in the lower carriage rail below the releasing cam bar, and means accessible "from the rear of the lower carriage rail for adjusting the ring.

2. A laterally movable carriage including a lower carriage-rail, a platen and a front pressure roll for the platen, both mounted on said carriage, means for supporting the pressure roll including a pivoted lever, a rearwardly extending stem n said 'lever below the point of its pivotal support, a coiled spring surrounding said stem and housed in the lower carriage rail, means accessible from the rear of the lower .carriage rail for adjusting the tension of the spring, and means for actuating the lever to release the pressure roll.

3. A laterally movable carriage including a lower carriage rail, a platen and a front pressure roll for the platen, both'mounted on said carriage, means for supporting the pressure roll including a lever, having a forwardly and a rearwardly extending arm, pivoted at its central portion the pressure roll being mounted in the forwardly eX- tending arm, a releasing cam bar located in the lower carriage rail. and engaging the rearwardly extending arm, a rearwardly extending stem on the lever below its pivotal point, a coiled spring surrounding said stem and housed within the lower carriage rail below the releasingcam bar, and means accessible from the rear oi' the lower carriage rail for adjusting the tension of the spring.

Signed at New York city, in the county of New York and State of New York, this 26th day of April, 1917.

ALBERT a. scnwanra,

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